“at the peak of her session activity she was making more money than the US President.” https://en.wikipedia.org/wiki/Carol_Kaye
https://en.wikipedia.org/wiki/The_Wrecking_Crew_(2008_film)
Trailer for “The Wrecking Crew” https://youtu.be/hhl-3EOYTkc
Good for her. She knew she had a lucrative skill and the talent to be creative. May as well demand proper payment.